Thanks for the invitation. I'm in Type-Moon, inheriting the legacy of Zi-O.

“…Ugh, ugh, ahh.” Fran opened her mouth, looked down at Babbage, and clutched the hem of her skirt.

"...I'm sorry, Victor's daughter." The crimson light had faded, only the gradually deteriorating voice still testified to Babbage's continued existence: "I can understand your words...but I am no longer...a human being with a proper life..."

A few points of crimson light appeared, and as he gazed at his massive mechanical body one last time, he found it utterly hideous.

“I… have already become… an obstinate… servant.”

"..." Mordred silently gripped the blade of his sword and turned his head to one side.

“…I…” Babbage repeated, as if shrouded in mist again, “…I, alas, dreamed of my own world…but, but…this is already…”

That psychedelic world in the steam was shattered by his own hands, right before his eyes and in his own hands.

"...Even if this world can no longer fulfill my dream," his gaze shifted to Ritsuka and the others, "I don't want to end your world..."

A dazzling golden light spread rapidly from his feet to his entire body, and Babbage's figure completely vanished.

Finally, the genius, who had been abandoned by the times and obsessed with steam, returned to the Throne of Heroes and back to that fantastical world.

“…It’s over.” Mordred slung the blade over his shoulder and stared at the now empty pit.

“Yes, everyone.” Although there was some reluctance on her face, Ritsuka clenched her fist. “—The next destination has been decided.”

“…Yes, it’s underground in the city.” Similarly, Mashu also raised her head, her face showing only the determination of battle. “Mr. Babbage did say that.” She addressed the deceased genius as “Mr.”

"...That's quite surprising." Nian Zhuo, however, stared blankly at Ritsuka and Mashu, who had already recovered.

Unseen by him, unnoticed by him, these two girls have grown so much.

From those two children who used to cry and needed him to pat their heads, she has become such a strong girl.

His eyes started to sting, so he turned away.

“That’s true.” Mordred buried his emotions deep inside and gently hugged Fran in his arms. “Let’s take Fran back to Jekyll’s apartment first, and then we’ll go and eliminate the final leader.”

"Yes, let's do it this way." Ritsuka's gaze hardened as she looked at Nencho, Mordred, and the others. "We will definitely get the Holy Grail."

“…You’re right, senpai.” Mashu stepped forward and gently patted Fran’s shoulder.

They traveled in silence until they reached Jekyll's apartment, where they settled Fran in.

"So that's how it is...?" Jekyll looked at the newspaper in his hand, his fingers gently tracing Babbage's portrait, a hint of sadness in his eyes. "Professor Babbage, he..."

But he quickly recovered from his grief and bowed deeply to everyone in front of him.

"Thank you everyone, and... thank you for your help!" Jekyll said with a smile as he expressed his gratitude.

“If you still consider us partners, then don’t say that…” Mordred patted his shoulder, settled Fran aside, stroked her brown hair, and then immediately turned and left.

"So, this singularity is almost over too?" Ryotaro looked at Nencho in front of him and tapped the table with his index finger. "Then, I'll go too."

"Ah..." Nianzhuo was momentarily stunned as he looked at Ryotaro, who was rubbing his hands together in anticipation.

"Haha, why are you looking at me so surprised?" Ryotaro tapped Nencho's brow and said with a slight smile, "Momotaros and the others are also getting impatient."

“This… could be very dangerous…” Nianzhuo was somewhat taken aback. “Besides, Ryotaro, your suspicions have already been cleared…”

"What are you saying?" Suddenly, a red hand slammed down on Nian Zhuo's back. It was Momotaros, looking defiant. "You think I'm afraid of that kind of suspicion? Don't be ridiculous!"

"We just want to witness your victory, at the very least." Ryotaro took off his glasses and smiled gently. "Also, don't underestimate your seniors, Nencho."

"...Then I'll have to trouble you! Please lend me a hand, Ryotaro-senpai!" Now that things had come to this point, what was there to worry about? Nianzhuo reached out his hand to Ryotaro in front of him.

"Hey! Hey! What about me? What about me!" Momotaros reluctantly stepped forward, looked at Ryotaro and Nencho's tightly clasped hands, and placed her hand on their clasped hands.

“…Idiot Momotaros.” Nian Zhuo was silent for a moment, then smiled and tapped Momotaros’s head with his free hand.

"Hey!!" Only Momotaros's exasperated voice remained, which eased the atmosphere in the apartment somewhat.

"Alright, alright, everyone, stop fooling around." Ritsuka clapped her hands, then pulled Mash and Nianzhuo along. "We're getting ready to go. Take care!"

Nencho, Ryotaro, Ritsuka, Mash, and Mordred were the last members to go into battle.

"Okay, take care on your journey." Jekyll waved as he watched everyone walk away.

Of course, it's also possible that along the way, the Babbage Exchange was completely defeated, and enemies like the Chaos Machine Soldiers have completely disappeared.

Following Babbage's last wishes, they went to the city center, beneath the London Underground.

“…Underground in Lentinion.” Carrying his sword, Mordred looked at the moss-covered walls around him. “I knew there was a subway underground, but I didn’t expect there to be even lower levels.”

Not only that, looking at the fog around him that was just as thick as... no, even thicker than the fog on the street, Mordred curled his lip in annoyance.

"And the concentration of this magical mist... is so much higher than up here." Mordred covered her nose in disgust, looking at the downward-stretching passage. "Does the mist get thicker the deeper you go...?!"

“This… even we can’t understand it very clearly here.” Mary interlaced her fingers and rested her hands on the table, looking at the ever-increasing values ​​on the screen with a headache. “After all, we can’t observe it directly here… but judging from the increase in concentration, which can be judged by visual inspection… Charles Babbage’s words should be true, since the passage leading to the underground does indeed exist.”

"Speaking of which... why would there be a place like this in London?" Looking at the very vintage decorations around her, Ritsuka scratched her head in confusion. "Was it established by the Mage's Association?"

“By the mid-19th century, London had already built an underground transportation network.” Mash ran her fingers along the wall, looking at the debris clinging to them, and shook her head. “...However, there is no record of such underground passages existing. ...Could it be traces left from the construction of a secret national project?”

“Let me think… The only place the Mage’s Association has excavated is directly beneath the British Museum…” Looking at the images sent from Mash, even Mary couldn’t tell if it was the work of the Mage’s Association. “It’s hard to imagine that this is an underground palace that someone secretly built. It’s possible that it existed before London was built?”

“Hmph, let me share my thoughts.” Scratching his hair, Mordred looked at the perplexed group. “There’s a saying that deep beneath the Tower of London lies the head of Bran, the King of ancient Britain, buried there to protect Lontinion.”

"A head..." Mash imagined the scene and shuddered uncomfortably.

"Haha, how about it? Interesting rumors, right?" Mordred nodded understandingly at Mash's reaction. "There are all sorts of legends about the Tower of London, like the raven and such."

"Ah, if that's it, I know a little about it too." Upon hearing the word "crow," Mashu quickly composed herself. "They say they protect London—"

"It's called King Arthur, ah, that is, my father's thing. Eh~ what a masterpiece~" Mordred said, seemingly dissatisfied, but he couldn't stop smiling. "It's a raven! Its incarnation is a raven, hahaha!"

“Sigh… those jet-black birds…” Mary stroked her chin. “I remember Romani seemed to really like those animals, thinking they were really cool. He even said something like, ‘Look! Isn’t the raven keeper pretty cool?’ Ah… he even asked Mashu what she thought!”

"Um..." Seemingly recalling some unpleasant memories, Mashu looked at Nencho and Ritsuka beside her. "So... what do you and Nencho-senpai think?"

"Ah...you've thrown the topic back at me." Nian Zhuo had just come to his senses when he saw Mashu biting her lip and couldn't help but chuckle.

“But, crows…” Nianzhuo closed his eyes and naturally thought of that pitch-black bird. “…I really can’t like it. In my world, crows are also a symbol of bad luck… What about Ritsuka?”

"Ah... Nianzhuo, you've thrown the topic back to me again." Ritsuka pouted, refusing to answer Nianzhuo's question, as she crossed her arms and made an "X" shape.

“Ah, this…” Nian Zhuo and Mashu exchanged a glance, both seeing the helplessness in each other’s eyes.

"Alright, alright, forget about the crows for now." Mordred, moving slowly and cautiously, looked down at the thick fog. "By the way, can't you investigate the structure of this underground passage from your side?"

"...I'm sorry." No matter how hard Mash searched for information about Chaldea, she couldn't find a single clue about the tunnels beneath the London Underground. "Just as Mash said, there are absolutely no records. You'll have to explore on your own." Mary tapped the table in frustration, her voice tinged with a hint of defeat.

"Honestly... if only the structure weren't so complicated." However, looking at the images transmitted back from Mash, Mary couldn't imagine it as a simple passage at all. "No matter how I look at it, it looks like a complete maze."

“Deep beneath London, in unknown underground passages, in a labyrinth.” Repeating the simple characteristics of this path, Mash gripped her shield tightly. “If Mr. Babbage is right, then there must be a [Large Machine].

“Yes… According to Mr. Babbage, it should be a huge steam engine.” Ritsuka also recalled Babbage’s words and looked into the increasingly thick fog that enveloped the underground depths.

“That’s right, that’s the source of the demonic mist that’s permeating all of London.” Mary flipped through the report in her hand, saying softly, “The massive steam engine Angorboda, powered by the Holy Grail. That’s what he said before he disappeared. I never imagined he would actually assemble the Holy Grail into a machine…”

“But in a way, it’s understandable.” Mary pondered, her head bowed. “After all, the existence of this fog filled with strange magic, and the extent to which it spreads, can not only disrupt the Servants’ perception abilities, but also hinder Chaldea’s various observation methods. Using the power of the Holy Grail would certainly be convincing, and such a thing should be possible.”

“Yes, that explains the pattern of Servants emerging from the mist.” Mash looked at the dense fog around her, wanting to reach out and touch it. “It’s possible that the mist was given the ability to summon Heroic Spirits by assembling the Holy Grail into a machine.”

“However, to name him Angelboda is quite an exaggerated name,” Mordred said with a hint of amazement.

"Ah...Angolboda? Does it have any special meaning?" Ritsuka looked completely clueless.

“Yes, Angorboda. A god in Norse mythology. She gave birth to Fenrir, the World Serpent, and the Goddess of Death, among others. ...Your tutoring hasn't ended there yet.” Mary tapped her forehead.

"The child's father is Loki, a giant beyond imagination. But he's not exactly unpleasant." Mordred stroked her chin, a hint of mockery in her voice. "Always causing trouble. —A woman like that isn't easy to find, you know?"

“No, I should say it’s very valuable for a fight.” Mordred chuckled, looking at the blade in his hand. “She must have a thick skin too, enough to let me cut her to my heart’s content.”

“(So, this is what it means to not dislike someone.)” Mary glanced to the side, somewhat puzzled by Mordred’s thoughts.

(I've had a hard time understanding this since just now; Mordred definitely said that on purpose, right?)

Mary raised her hand, tapped the table lightly, and sighed.

The final enemy, the countdown has begun!

Compared to Mary's distressed expression as she banged on the table, Mashu's attention was clearly not on that.

“(Ah, um, I remember Mordred’s mother should be…)” Quietly moved to the side, turned on the communication device that was separate from Mary, and asked Mary, who was looking troubled, in a low voice.

"(Ah? Oh, right. The witch of witches, Morgan...!)" Coming to her senses, Mary naturally recalled Mordred's mother from the official history, and shuddered slightly.

"--Oh my, they've finally arrived." Mash was about to say something more when Mordred suddenly approached, causing her to immediately close the private channel. "Hmm? The enemy is here." Mordred casually pointed ahead.

"Ha...you beat me to it again..." Mary turned on the communicator as if nothing had happened, looking at the multiple red dots that appeared on the screen a step too late. "Another reaction to multiple moving objects! But this time...there shouldn't be any Chaos Machine Soldiers below. Regardless of their strength, their numbers are a bit troublesome. Anyway, be careful!" After quickly finishing what she needed to say, Mary immediately turned off the communicator.

"Haha, finally here!" Nian Zhuo bumped fists and looked at the multiple black figures emerging from the thick fog, spinning the Time Spear Sword in his hand in a flourish. "Seriously, I couldn't wait any longer."

After saying that, Nianzhuo raised his gun and pulled the trigger towards the enemy emerging from the thick fog.

The purple energy blast instantly shattered the monster's head, and its body dissipated into particles of magic.

“But it’s an automaton…” Nian Zhuo stroked his chin, but that didn’t stop him from pulling the trigger again.

"Hey! That's foul, Nianzhuo!" Mordred turned around and waved her sword at him, saying with dissatisfaction, "My hands are itching too! Leave me a few, or I'll have to come to you to relieve my stress!" With a wave of her sword, Mordred charged towards the group of automatons that surged out without waiting for Nianzhuo's reply.

"Ah... um, Mash, go help Mordred..." Scratching her head in some trouble, Ritsuka looked at the excited Mordred and helplessly told Mash to keep an eye on the berserker-like Saber and not let her run too far.

"Alright, Momotaros, let's just stay here and watch Ritsuka and Nencho without worry." Patting Momotaros on the shoulder, Ryotaro shook his head helplessly at his companion's eager look. "Don't worry, your time will come eventually."

However, the sheer amount of experience they had gained made these automatons seem far from being a threat to Nian Zhuo and his group. Mordred's simple sword strike alone could destroy multiple automatons. Even if their numbers were still unknown and they were to emerge from the mist, it would simply be a matter of swinging a sword or pulling a trigger once more.

...Anyway, the fact that Mashu had the leisure to observe Ritsuka and Nenjo's safety even while on defense says a lot.

Fighting as they advanced, the enemy gradually disappeared from the thick fog before they knew it.

Meanwhile, Nian Zhuo and Mordred arrived beneath the London Underground, in that completely unknown territory.

"...The battle is over just like that?" Mordred was even a little hard to accept, but she sheathed her sword and looked around in confusion. "Eh...wasn't this place already well hidden?"

The surrounding decorations lost their vintage feel, and the dim yellow light barely illuminated anyone's profile, casting only dappled shadows on the ground.

“However, judging from our speed and the depth... this should be the second level.” Nian Zhuo looked at the surrounding walls, and could even smell the unique scent of soil, which was also slightly damp.

“Besides, we’ve traveled quite a distance this time…” Naturally, he noticed their distance and opened the London map he had obtained from Jekyll. “Our current location… well, we should be underground in the Hyde Park area.”

"Really, it seems we've come a long way..." Ryotaro suddenly became lively, propping his arms up behind his head.

“…Ah, it’s Ryutaros.” Nencho instantly recognized the Imagin possessing Ryotaro, or more accurately, recognized the purple hair on Ryotaro’s head. He tapped Ryotaro’s forehead. “Alright, alright, tone it down. We’re underground now.”

"Okay~ okay~" Longtaros agreed on the surface, then turned around and started fighting with Momotaros.

"By the way, Director Mary," Ritsuka suddenly said, looking around seriously, "we've been walking for so long and still haven't reached our destination. Have we been going around in circles?"